Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b5ed003954b942…

MALICIOUS

PDF

90.4 KB Created: 2021-07-28 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2be42540814eebce2142a4c53d3e4310 SHA-1: 83c860f18f90d4c035d791379f4a6feca3876fe8 SHA-256: 03b5ed003954b942221fa8d87580998a92b36ee5eb42dd532a565a0baad91051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872297dfcca---72446278573.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l2pkpl2lp8auv88gq8k2jhd64k/71965897302.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba60770ab6---fexutorawosis.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sshgu5ckekju0edva074e2lnqs/36551131405.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/10159389357.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/puvodezedovokozeleretamot.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/2736373520.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9qhvtonh06qdl01ps165ua06t1/48441970279.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3e5c26dcd5ee4bffdc058835a742fdc1/metojad.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/74484975946.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5e4182b45---muvabapese.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608804ffcfb47---xutanagitoluzumasugufemol.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/93563426110.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/91731431692.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66182c5d5---gujibuka.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/39844628421.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a1a7305235a2c8f6030d68e20d1a4823/77543490750.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/88799328390.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wukegolobujixuru.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/99590023e624ee42cd9410bbd35988e7/24669157846.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/28932448545.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/poqkqnnq0au4povmmjsf8mpif0/limokegozobasoba.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/duwavaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=como+fazer+pimenta+siria+receitaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10688 bytes
SHA-256: ebb6fc3426d603ec560bd15d68ed58b1c5f0961f71aea44e927dd5a0b3644a81
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 19356 bytes
SHA-256: b362057f4c328c79020a3d0e65957056eeb2b8cf4420ea880d4c738e09e0e5ad
font_02_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16380 bytes
SHA-256: a922768a947ea675ee2c94c36d3193cb7c264d4bd7e20182db815ee5993271c3
font_03_sfnt_off00014134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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